Patterned Polarizer for Head-Mounted Display Eye Tracking
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Solution Overview
Problem
Existing image display apparatuses face challenges in achieving high detection accuracy and information acquisition while maintaining a small weight and size, particularly in indoor devices, due to space restrictions and the need for separate optical systems.
Innovation Solution
The integration of a light receiving section with sensitivity in the invisible range, an image display panel, and a near-infrared polarizer with polarization selectivity, positioned between the emission surface and the image display panel, allows for improved detection of invisible light and reduced noise, enabling accurate detection of object features like eye movement and facial expressions without increasing device size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large space is ensured for the optical system to improve detection accuracy and reduce noise, then measurement precision is improved, but device size and weight increase
Solution Approach 1:
The patent combines the visible light display function and invisible light detection function into a single integrated device. The light receiving section is positioned to overlap with the image display panel, allowing both functions to share the same physical space and structural components, thereby achieving high detection accuracy without increasing device size.
Solution Approach 2:
The patent utilizes different wavelength dimensions (visible light for display, invisible light for detection) to perform multiple functions simultaneously within the same physical space. By operating in different spectral ranges, the system avoids spatial interference between the display and detection functions.
2Measurement precision
If separate optical systems are used for display and detection to reduce noise, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the optical system by wavelength function, with the light receiving section configured to receive only invisible light while the image display panel emits only visible light. This functional segmentation allows both systems to operate independently without interference, maintaining high detection accuracy while integrating within a single device structure.
Solution Approach 2:
The patent creates a universal device that performs both visible light display and invisible light detection functions. The light receiving section is integrated into the display device structure, enabling the single device to serve multiple purposes: visual display and optical detection, thereby reducing overall system complexity.
3Volume of moving object
If the light receiving section is positioned to overlap the image display panel to save space, then device size is reduced, but noise from the display may interfere with detection
Solution Approach 1:
The patent changes the wavelength parameter of the light received by the light receiving section to be in the invisible range, while the image display panel emits only visible light. This parameter differentiation ensures that the display light does not interfere with the detection function, even when the components are positioned in overlapping spatial configurations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances detection accuracy and information acquisition while maintaining a compact design by minimizing space usage and reducing noise interference, allowing for effective eye tracking and facial recognition in head-mounted displays.
Implementation Method 1
a near infrared polarizer having polarization selectivity in a near infrared range is provided between the light receiving section and the emission surface
Data Source
AI summary
Provided are an image display apparatus; an image display system; a head-mounted display, and a patterned polarizer. The image display apparatus includes a light receiving section having sensitivity in an invisible range; an image display panel having a substrate and a plurality of pixels disposed thereon; and an emission surface that emits a luminous flux in a visible range, in which the light receiving section receives only invisible light in light incident into the image display apparatus through the emission surface, and is provided between the emission surface and the image display panel, on the image display panel, or on a side of the image display panel opposite the emission surface, and disposed at a position overlapping the image display panel viewed from a direction perpendicular to the emission surface, and a near infrared polarizer is provided between the light receiving section and the emission surface.